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Registros recuperados: 90
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Acoustical monitoring of fish density, behavior, and growth rate in a tank ArchiMer
Conti, Stéphane; Roux, Philippe; Fauvel, Christian; Maurer, Benjamin; Demer, David.
A challenge for the aquaculture community has long been the development of harmless techniques for monitoring fish in a tank. Acoustic telemetry has been used to monitor fish swimming behavior, and passive acoustics have been used to monitor fish feeding, but new techniques are needed to monitor non-invasively their numbers and growth rates. Recently, it has been demonstrated that the acoustical total scattering cross section of fish swimming in a tank can be measured from multiple reverberation time series. These measurements have been used successfully to estimate the number of fish in a tank in laboratory conditions, and to characterize their acoustical signatures. Here, we introduce a novel method for acoustically monitoring fish numerical density and...
Tipo: Text Palavras-chave: Total scattering cross section; Fish counting; Growth rate; Remote monitoring; Fish behavior.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1121.pdf
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Age and growth of Zapteryx brevirostris (Elasmobranchii: Rhinobatidae) in southern Brazil Neotropical Ichthyology
Carmo,Wanessa P. D.; Fávaro,Luís Fernando; Coelho,Rui.
ABSTRACT Age and growth studies are fundamental to successful fisheries management. Zapteryx brevirostris (Müller & Henle, 1841) is distributed off the Brazilian continental shelf and this species is assessed as “Vulnerable” in the Red List of the International Union for the Conservation of Nature (IUCN). Thus, the objective of this study was to present previously unknown information about the age and growth of Z. brevirostris that can be used for its management, conservation, and fisheries. A total of 162 specimens were sampled, with total lengths (TL) varying between 35.7 cm and 56 cm. The vertebrae were embedded in resin, sectioned in cuts with 0.5 mm thickness and the growth bands of the vertebrae were read under a light microscope. In the studied...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Back-calculation; Conservation; Growth rate; K value; Von Bertalanffy curves (VBGF).
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100210
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Animal production and canopy attributes of Cynodon pasture managed under continuous stocking with wethers at three levels of forage allowance R. Bras. Zootec.
Santos,Márcia Vendrúsculo dos; Kozloski,Gilberto Vilmar; Quadros,Fernando Luiz Ferreira de; Pires,Cleber Cassol; Wommer,Tatiana Pfüller; Mônego,Camila Ornelas.
The objective of the present experiment was to evaluate the effect of forage allowance (3, 6 or 9 kg of green leaves dry matter (DM)/100 kg of body weight (BW)) on both animal performance and attributes of Cynodon dactylon var.dactylon canopy managed under continuous stocking by wethers. The study was carried out with 27 Polwarth wethers throughout five 28-day periods, in a completely randomized experiment, which included three paddocks per treatment and three tester animals per paddock. Forage mass varied from 2878 to 6580 kg of DM/ha and was directly related to forage allowance. Leaves proportion (mean of 23%) and leaves growth rate (mean of 25 kg of DM/ha/day) varied between experimental periods in a similar rate for all treatments. Stocking rate varied...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cynodon dactylon var. dactylon; Growth rate; Intake; Live weight gain; Sheep; Tropical grass.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000100026
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Annual skeletal extension of two reef-building corals from the Colombian Caribbean Sea OceanDocs
Charry, H.; Alvarado, E.M.; Sánchez, J.A..
The skeletal growth of the scleractinian corals Diploria labyrinthiformis (Linnaeus 1758) and Montastraea annularis (Ellis and Solander 1786) from Isla Grande (north of Rosario islands), Colombian Caribbean, was determined from annual extension increments revealed by X-radiography of 4-6 mm thick slabs obtained along the axis of maximum growth. The skeletal extension average rate for the last 22 years for D. labyrinthiformis was 3.8 mm year-1 (SE 0.10; N = 87). The correlation between growth of D. labyrinthiformi s and hours of sunlight was significantly negative. The annual variances of sunlight enhanced annual statistically significant differences of growth in this species. M. annularis showed an average extension growth of 10.6 mm year-1 (SE 0.32; N =...
Tipo: Journal Contribution Palavras-chave: Growth rate; Coral reefs; Coral reefs; Growth rate; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_16130.
Ano: 2004 URL: http://hdl.handle.net/1834/3077
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Artificial family selection based on growth rate in cultivated lines of Litopenaeus vannamei (Decapoda, Penaeidae) from Venezuela Genet. Mol. Biol.
De Donato,Marcos; Ramirez,Raúl; Howell,Chris; Verginelli,Roberto; Orta,Tomás; Cabrera,Saúl; Mata,Enrique; Manrique,Ramón.
We investigated the effects of family selection on the growth rates of four genetic lines of Litopenaeus vannamei, the Pacific white shrimp, from Venezuela. The mean family weight at selection was 16.79 g and the mean growth rate was 0.169 g d-1 at a mean age of 138 days. The mean growth rates per generation were 0.141 g d-1 for the parental generation (P0), 0.173 g d-1 for the F1 and 0.191 g d-1 for the F2. Survival varied from 83.3% to 94.4%. There were statistically significant differences between lines, with lines B and C, growing at higher temperatures and lower salinities, showing the fastest growth. Regression analysis between growth rate and age for each genetic line showed high r² values, but smaller than those shown between growth rate and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Family selection; Genetic improvement; Growth rate; Litopenaeus vannamei.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500009
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Aspectos biológicos y pesqueros de los principales peces del sistema hídrico de la provincia de Los Ríos, durante 2009 OceanDocs
Revelo, W..
Durante el 2009 (excepto mayo, agosto y septiembre), se analizaron un total de 3 772 especímenes de peces conformados por 16 especies, predominando la dica con 1561 individuos (42,3%), las menos capturadas fueron róbalo y chame con un individuo cada una (0,03%). La proporción de sexo macho hembra, talla promedio de captura y media de madurez sexual de las principales especies de peces fue: dama (1: 1,16; 23,7 y 20 cm LT), dica (1: 1,15; 17,3 y 16 cm LT), guanchiche (1: 1,2; 29 y 20 cm LT), ratón (1: 1,25; 23,5 y 19 cm LT) y bocachico (1:1,06; 21,6 y 20 cm LT). En los estadios de madurez sexual, la mayoría de las especies se encontraron en estadio I y II correspondientes a individuos hembras inmaduras; sin embargo, para el guanchiche predominaron las...
Tipo: Journal Contribution Palavras-chave: Rivers; Species diversity; Sexual maturity; Growth rate; Catch composition; Freshwater fish.
Ano: 2010 URL: http://hdl.handle.net/1834/4790
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Bathymetric distribution and growth rates of Eunicella verrucosa (Cnidaria: Gorgoniidae) populations along the Marseilles coast (France) ArchiMer
Sartoretto, Stephane; Francour, Patrice.
Gorgonians are important organisms in the Mediterranean Sea, where they form rocky benthic communities. Four main species (3 Holaxonia and 1 Scleraxonia) are predominant in infra- and circalittoral communities of the northwestern Mediterranean basin. Other species, such as Eunicella verrucosa (Pallas, 1766), are more rarely encountered. The expansion to unusually shallow bathymetric levels has been noted in the region of Marseilles (France) (between 20 and 40 m depth). A ten-year monitoring of colonies was used to assess the growth rate according to age (size): from 3.33 cm year(-1) (height <15 cm) to 0.62 cm year(-1) (height >40 cm).
Tipo: Text Palavras-chave: Eunicella verrucosa; Mediterranean Sea; Growth rate; Population structure.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00087/19859/17508.pdf
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Capacité de l'espace côtier face a la croissance des usages : problèmes et strategies OceanDocs
Blivi, A.B..
En Afrique de l'Ouest, particulièrement dans le golfe du Bénin, les grandes villes, Accra, Lomé, Cotonou, Lagos se localisent dans la zone côtière de cordons assez étroits associés à des milieux lagunaires et de vasières relativement importants. Les progrès de modernisation y sont marqués par les installations d'industries de tout genre autour des ports, par le développement des zones d'habitats de caractère formel et informel dû à la croissance de la population et par les nombreuses activités économiques. Cette dynamique se poursuit dans la zone côtière qui continue d'être utilisée presque sans programme de planification et de développement. Les nombreuses ressources socio-économiques évoluent rapidement et attestent le dépassement des possibilités...
Tipo: Journal Contribution Palavras-chave: Growth rate; Harbours Coastal zone Population number Population dynamics Population dynamics http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 1999 URL: http://hdl.handle.net/1834/1238
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Características biológicas y de la pesca del savorín Seriolella porosa (Pisces: Centrolophidae) del Mar Argentino OceanDocs
Garciarena, A.D.; Perrotta, R.G..
Length growth parameters were calculated and total length-weight and total length-fork length relationships, which showed no differences between sexes, were fitted for the South Atlantic bream (Seriolella porosa). Length at first maturity was also calculated. The results were as follows: L (mm)= 490.96k years-¹) = 0.154; t0 (years)= -3.915; W(g) = 4*10-6)*TL³.1989; FL(mm) = 0.8917*TL1.0006);L sub 50 (mm)= 290.61. Natural mortality was estimated at 0.274 and limit age at 11 years. Samples were taken during research surveys carried out in 1999 and 2000 in the Argentine Sea (Atlantic SW). Sagittae otoliths of 374 specimen were used for age determination. Total fish length ranged from 226 mm to 550 mm (1-14 years). Commercial landing data of trawl fleets for...
Tipo: Journal Contribution Palavras-chave: Growth rate; Natural mortality; Length-weight relationships; Catch/effort; Landing statistics; Fishery biology; Fishery resources; Growth rate; Fishery biology; Fishery resources; Http://aims.fao.org/aos/agrovoc/c_16130; Http://aims.fao.org/aos/agrovoc/c_2937; Http://aims.fao.org/aos/agrovoc/c_2942.
Ano: 2002 URL: http://hdl.handle.net/1834/2416
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Changes in growth variables and potassium content in leaves of Black Barley in response to NaCl Braz. J. Plant Physiol.
Abu-Al-Basal,Mariam A.; Yasseen,Bassam T..
Much attention is being focused on the Black barley (Hordeum distichum L.) as a local cultivar offering good model for a cereal crop has traits of resistance to drought and salinity during vegetative growth stages. Although Black was sensitive to salt stress during germination, it developed gradual tolerance with age and proved very tolerant during growth and development stages. The data of study clearly revealed how this cultivar was superior over Arivat (Hordeum vulgare L.) in many physiological aspects such as leaf growth variables (i.e. rate and duration) and processes (i.e. cell division), tiller production and potassium content. Black barley had more tillers, faster rate and longer duration of growth processes which was accompanied with potassium...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Black barley; Hordeum distichum L.; Cell division; Growth rate; Growth duration; Leaf growth; Arivat; Hordeum vulgare L.; Potassium; Salt stress.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000400002
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Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems ArchiMer
Collos, Yves; Jauzein, Cecile; Ratmaya, Widya; Souchu, Philippe; Abadie, Eric; Vaquer, André.
Diatom blooms in Thau lagoon are always related to rain events leading to inputs of inorganic nutrients such as phosphate, ammonium and nitrate through the watershed with time lags of about 1 week. In contrast, blooms of Alexandrium catenella/tamarense can occur following periods of 3 weeks without precipitation and no significant input of conventional nutrients such as nitrate and phosphate. Field results also indicate a significant drop (from 22–25 to 15–16 μM over 3 days) in dissolved organic nitrogen (DON) at the bloom peak, as well as a significant inverse relationship between A. catenella/tamarense cell density and DON concentrations that is not apparent for diatom blooms. Such dinoflagellate blooms are also associated with elevated (6–9 μM) ammonium...
Tipo: Text Palavras-chave: Alexandrium catenella/tamarense; Non classical blooms; Organic nitrogen; Ammonium; Growth rate.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00194/30488/29758.pdf
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Comportamiento productivo del pasto ovillo (Dactylis glomerata L.) en respuesta al pastoreo Colegio de Postgraduados
Hernández Guzmán, Filogonio Jesús.
El pasto ovillo es una de las gramíneas mas usadas en la producción animal, en la zona templada de México. Sin embargo, la gran variación en los resultados encontrados en praderas de pasto ovillo hacen necesario generar información acerca del manejo mas apropiado tanto de la frecuencia como intensidad de defoliación. El objetivo de este estudio fue determinar la frecuencia e intensidad de pastoreo que proporcione mayor rendimiento de forraje en una pradera de pasto ovillo (Dactylis glomerata L.). La investigación se llevó a cabo en el Colegio de Posgraduados, Campus Montecillo, Edo de México de junio 2005 a junio 2006. Los tratamientos fueron la combinación de tres frecuencias (21, 28 y 35 días) y dos intensidades (5-7 y 9-11 cm) de pastoreo, que se...
Tipo: Tesis Palavras-chave: Dactylis glomerata L.; Frecuencia e intensidad de pastoreo; Rendimiento de forraje; Tasa de crecimiento; Composición botánica; Densidad de tallos; Maestría; Ganadería; Grazing intensity and frequency; Forage production; Growth rate; Botanical composition; Stem density.
Ano: 2007 URL: http://hdl.handle.net/10521/1564
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Crecimiento, arquitectura y anatomía de especies forestales en una selva baja caducifolia del sur de Yucatán Colegio de Postgraduados
Interián Ku, Víctor Manuel.
Caesalpinia gaumeri Greenm y Gymnopodium floribundum Rolfe, son especies forestales importantes para los Mayas de Yucatán, que se utilizan en las construcciones rurales y para la producción apícola respectivamente. El propósito de este trabajo es conocer el crecimiento en diámetro, arquitectura, morfometría y anatomía de C. gaumeri y la arquitectura y morfometría de G. floribundum. En C. gaumeri la tasa anual de crecimiento aumentó de las categorías menores a las mayores (0.41-0.85 cm), de las calidades de copa dañadas a las simétricas (0.23- 0.85 cm) y de las incidencias de luz parciales a las totales (0.53-0.84 cm). El crecimiento acumulado en diámetro fue significativamente (Tukey, P < 0.05) mayor para las categorías diamétricas de 12.5 a...
Tipo: Tesis Palavras-chave: Kitimché; Tzitzilché; Bandas dendrométricas; Posición y calidad de copa; Tasa de crecimiento; Morfología; Estructuras celulares; Doctorado; Botánica; Kitimché; Tzitzilché bands dendrometrical; Position and quality of canopy; Growth rate; Morphology; Cellular structures.
Ano: 2009 URL: http://hdl.handle.net/10521/1474
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Crecimiento poblacional del rotifero nativo Brachionus sp. “Cayman”, al evaluar diferentes microalgas como alimento OceanDocs
Cisneros, R..
Se estudió el crecimiento poblacional de la cepa Brachionus sp. “Cayman”, cepa Chilca, Perú, en respuesta a diferentes tratamientos con microalgas: Isochrysis galbana (T1), Chaetoceros gracilis (T2), Nannochloropsis oculata (T3), Isochrysis galbana + Chaetoceros gracilis + Nannochloris maculata (T4), Isochrysis galbana + Nannochloris maculata + Nannochloropsis oculata (T5) y Nannochloris maculata (T6). Se evaluó la densidad final de la población (DF), tasa de crecimiento (TC) y productividad (R). Los resultados mostraron diferencias estadísticas entre los tratamientos, encontrándose que T5 presentó mejores resultados en cuanto a DF (190 ± 5,51 indiv.mL-1), TC (0,40 ± 0,01 día-1) y R (38 080 ± 1,53 rot.L-1.día-1).
Tipo: Journal Contribution Palavras-chave: Growth rate; Productivity; Algae resources; Rotifers; Productivity.
Ano: 2012 URL: http://hdl.handle.net/1834/5718
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Crecimiento y rendimiento en carne del Lenguado Paralichthys orbignyanus (Valenciennes, 1839) cultivado en Argentina OceanDocs
Müller, M.I.; Radonic, M.; López, A.V.; Bambill, G.A..
The results of the final on-growing (500 g to 1 kg)of flounder Paralichthys orbignyanus under closed recirculated water systems and controlled conditions are presented. 22.5 percent of fish reached 1 kg alter 2.1 months of starting the on-growing trial. Sex ratio was 20.6 percent females and 79.4 percent males. Average length for females and males was 38.53 ± 4.58 cm TL and 32.52 ± 5.25 cm TL, respectively. Average body weight for females and males was 710.58 ± 262.95 g and 427.59 ± 203.01 g, respectively. Statistically significant differences were found for average length for sex (p0.01)and for average body weight for sex (0.01 0.05). Flesh yield was 43.1percent fillets without skin and 57percent fillets with skin. Flesh of cultivated flounder had a...
Tipo: Proceedings Paper Palavras-chave: Fish culture; Marine fish; Growth rate; Feeding; Fish culture; Feeding; Growth rate; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_16130.
Ano: 2006 URL: http://hdl.handle.net/1834/1570
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Croissance des juvéniles du merlu (Merluccius merluccius) des eaux septentrionales de la Tunisie à partir de l'analyse des microstructures des otolithes ArchiMer
Khoufi, Widien; Elleboode, Romain; Jaziri, Héla; El Fehri, Safouène; Bellamy, Elise; Ben Meriem, Sadok; Romdhane, Mohamed; Mahe, Kelig.
Hake (Merluccius merluccius) is widely distributed in the Atlantic Ocean and the Mediterranean Sea. It is one of the most exploited demersal fish. In Tunisia, hake is captured from the north to the south (KHOUFI et al., 2010). Hake is an important species of economic interest and thus the subject of a large literature, but its biology remains insufficiently known, particularly on terms of age and growth estimations, which are essential for stock assessment and management. Otolith microstructure provides a useful tool for age determination of juvenile hake, based on daily increment deposition (ARNERI & MORALES-NIN, 2000; MORALES-NIN et al., 2005; KACHER & AMARA, 2005; BELCARI et al., 2006). Consequently, we studied growth and estimated age, using...
Tipo: Text Palavras-chave: Merluccius merluccius; Microstructure journalière; Phase pélagique; Taux de croissance; Merluccius merluccius; Daily microstructure; Pelagic phase; Growth rate.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00116/22681/20416.pdf
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Culture en conditions optimisées de la macroalgue rouge <Gracilaria gracilis> (stackhouse) steentofr et al. dans le lac de Bizerte OceanDocs
Ksouri, J.; Challougui, I.; Mensi, F..
La culture de Gracilaria a été réalisée selon le mode de bouturage dans la partie Nord-Est du lac de Bizerte du 15 Avril au 31 Mai 2006 afin de déterminer l'effet des conditions initiales optimisées sur le rendement final. Ces conditions initiales, sont caractérisées par une culture sur le fond (sur cordes tendues), un poids initial des touffes de 200 g, une distance entre les rangées de culture de 50 cm et un écartement entre les touffes de 30 cm; de ce fait, la densité initiale est de 1,4 kg/m². Au terme de 46 jours de culture, nous avons enregistré un accroissement du poids de 200 g à 1280 g engendrant un taux de croissance spécifique de 4,03 %/j et une densité finale de 9,1kg/m² (soit 91t poids frais/ha).
Tipo: Journal Contribution Palavras-chave: Algal culture; Aquaculture systems; Aquaculture techniques; Density; Growth rate; Off-bottom culture; Seaweed culture; Aquaculture techniques; Seaweed culture; Algal culture; Density; Growth rate; Http://aims.fao.org/aos/agrovoc/c_28992; Http://aims.fao.org/aos/agrovoc/c_6914; Http://aims.fao.org/aos/agrovoc/c_31892; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_16130.
Ano: 2008 URL: http://hdl.handle.net/1834/3795
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Defasagem entre as produtividades real e potencial do algodoeiro herbáceo: limitações morfológicas, fisiológicas e ambientais. Infoteca-e
BELTRÃO, N. E. de M.; AZEVEDO, D. M. P. de.
Fatores limitantes relacionados com a morfologia, a organografia e arquiteture do algodoeiro herbaceo; fatores limitantes relacionados com -a fisiologia e a bioquimica da planta do algodoeiro herbaceo; fatores limitantes relacionados com as condicoes do ambiente; consideracoes holoticas envolvendo fatores da planta e do ambiente.
Tipo: Livro técnico (INFOTECA-E) Palavras-chave: Herbaceo; Taxas de Crescimento; Cultura; Fotorrespiracao; Trofofilos; Dossel; Balanco; Assimilado; Limitacao incontrolavel; Desenvolvimento; Brasil; Paraiba; Annual cotton; Production; Growth rate; Reespiration; Assimilation; Crop; Levll; Not controllable; Limitation; Growth; Deelopment.; Algodão; Bioquímica; Crescimento; Fotossíntese; Fisiologia Vegetal; Gossypium Hirsutum; Metabolismo; Respiração.; Produção; Biochemistry; Canopy; Leaves; Physiology.; Photosynthesis; Photorespiration; Metabolism.
Ano: 1993 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/264934
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Determination of larval instars in Chironomus sancticaroli (Diptera: Chironomidae) using novel head capsule structures Rev. Bras. Zool.
Richardi,Vinicius S.; Rebechi,Débora; Aranha,José M. R.; Navarro-Silva,Mário A..
Determining the age composition of a population is important when conducting ecological, taxonomic and environmental assessments. Morphometric measurements of the head capsule, especially the length and width, are widely used in the identification of insect instars, but alternative ways for determining the age of insects can expand the options for the analysis of field and laboratory populations. This study evaluated the morphometry of the antennae, mandibles, mentum and ventromental plates to discriminate among the four larval instars of Chironomus sancticaroli Strixino &amp; Strixino, 1981. The larvae were reared in the laboratory under constant temperature (25°C) and photoperiod of 12/12 hours for 19 days, with a supply of food. Fifteen larvae were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Growth rate; Head capsule; Instars; Morphometry.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000200011
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Developing decision-making tools for improving pasture quality on deer farms in New Zealand AgEcon
Stevens, David R.; Woodward, Simon J.R.; Westbrooke, Victoria F.C..
This paper describes the development of a learning package to support improved pasture quality on New Zealand deer farms. The first step has been to determine the specific requirements of deer farmers that will enable them to improve pasture quality decisions on-farm. Decision support software that interprets and demonstrates the impacts of pasture quality and animal physiology on the performance of young growing deer has also been developed. Key themes identified to aid pasture management decision-making included identifying the right pasture quality, management systems to maintain pasture quality and maximising the potential of livestock. This paper reports on the type of knowledge that deer farmers require in the learning package.
Tipo: Article Palavras-chave: Decision making; Deer; Growth rate; Learning packages; Pasture quality; Software; Farm Management.
Ano: 2005 URL: http://purl.umn.edu/123143
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